If you choose to use a servlet session listener, keep in mind that the
Tapestry Registry can be obtained from the application context under this
key "TapestryFilter.REGISTRY_CONTEXT_NAME".
Then you can have access to all Tapestry 5 services including the
ApplicationStateManager.
2009/9/30 Gunnar Eketrapp <gunnar.eketr...@gmail.com>
> Hi !
>
> I am porting a huge jsp/spring kludge to T5. (And love it ...)
>
> I have now come across a UserTracker implementation that tracks currently
> logged in users.
>
> How is this best done in T5 anyone?
>
> I could perhaps stick with the old servlet but I am not sure of how T5
> creaets/destoys sessions and
> adds/removes attributes.
>
> You know now I have a state ASO where the user object is stored within.
>
> Thanks in advance,
> Gunnar Eketrapp,
> Stockholm, Sweden
>
>
>
>
> ========================================================================
> Current User tracker implementaon using HttpSessionListener +
> HttpSessionAttributeListener
> ========================================================================
>
> public class UserTracker implements HttpSessionListener,
> HttpSessionAttributeListener {
> private static final Logger logger =
> Logger.getLogger(UserTracker.class.getName());
> private static UserTracker instance;
>
> public static UserTracker getInstance() {
> return instance;
> }
>
> public UserTracker() {
> instance = this;
> }
>
> private SortedSet<UserTrackerEntry> current = new
> TreeSet<UserTrackerEntry>();
>
> public SortedSet<UserTrackerEntry> getCurrent() {
> SortedSet<UserTrackerEntry> result = new
> TreeSet<UserTrackerEntry>();
> synchronized (current) {
> result.addAll(current);
> }
> return result;
> }
>
> public SortedSet<String> getCurrentUsernames() {
> SortedSet<String> result = new TreeSet<String>();
> synchronized (current) {
> for( UserTrackerEntry en : current ) {
> result.add(en.getUsername());
> }
> }
> return result;
> }
>
> public void attributeAdded(HttpSessionBindingEvent e) {
> if( "user".equals(e.getName()) ) {
> User user = (User) e.getValue();
> synchronized (current) {
> String sessionId = e.getSession().getId();
> current.add(new
> UserTrackerEntry(user.getUsername(),user.getFullName(),sessionId,new
> Date()));
> }
> }
> }
>
> public void attributeRemoved(HttpSessionBindingEvent e) {
> if( "user".equals(e.getName()) ) {
> User user = (User) e.getValue();
> synchronized (current) {
> String sessionId = e.getSession().getId();
> current.remove(new
> UserTrackerEntry(user.getUsername(),user.getFullName(),sessionId,new
> Date()));
> }
> }
> }
>
> public void attributeReplaced(HttpSessionBindingEvent arg0) {
> // ignore
> }
>
> public void sessionCreated(HttpSessionEvent e) {
> User user = (User) e.getSession().getAttribute("user");
> if( user != null ) {
> synchronized (current) {
> String sessionId = e.getSession().getId();
> current.add(new
> UserTrackerEntry(user.getUsername(),user.getFullName(),sessionId,new
> Date()));
> }
> }
> }
>
> public void sessionDestroyed(HttpSessionEvent e) {
> User user = (User) e.getSession().getAttribute("user");
> if( user != null ) {
> synchronized (current) {
> String sessionId = e.getSession().getId();
> current.remove(new
> UserTrackerEntry(user.getUsername(),user.getFullName(),sessionId,new
> Date()));
> }
> }
> }
>
> }
>
